Malicious PDF — malware analysis report

Static analysis result for SHA-256 c732714a471114fa…

MALICIOUS

PDF

33.9 KB Authoring application: Karbon
MD5: 0eec6acb6ed1e2cf097c6b2d11fb8c3f SHA-1: 2c63d18e985a6a6213c3d9033abfeacf82b26b06 SHA-256: c732714a471114fad3ef4353a3b8773447902a44b8be325f6d47afbc8dd8240d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to drive traffic to external URLs. The document body, though heavily obfuscated, contains text related to 'Fta fixed guideway definition', likely a lure. The primary malicious URL identified is http://pekingese.ru/uploads/2020/01/28/4aac95a.pdf, which is flagged as unknown reputation but is the dominant host in the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pekingese.ru/uploads/2020/01/28/4aac95a.pdf
    • https://lenapivavupepij.weebly.com/uploads/1/3/0/4/130436362/venobopixolubabuse.pdf
    • http://cascadeskarate.com/uploads/1/3/0/3/130312998/4805782.pdf
    • https://sopixizuzema.weebly.com/uploads/1/3/0/4/130494172/7216369.pdf
    • http://kicon-academic.com/uploads/1/3/0/4/130476200/migexinavu.pdf
    • http://pizaxewugu.acces-agicoles.com/uploads/2020/01/27/5626448.pdf
    • http://woodlandharvestmountainfarm.org/uploads/1/3/0/4/130483928/ganifeparexik.pdf
    • http://nuohotel-zh.devsite-1.com/uploads/1/3/0/6/130639450/130639450.html#fta+fixed+guideway+definition

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001101.bin
68aebce6940072c4a4eee31fefe40993f779279e969d55260e531869dec33830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1101 7636 bytes

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